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Mezzanine and Shareholders' Equity - Warrants Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 21, 2018 | Mar. 30, 2016 | Oct. 14, 2015 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) | 600,000 |  |  |  |
Warrants exercises in period (in shares) |  |  |  | 177,405 | 286,357
Warrant issued during period value stock options exercised |  |  |  | $ 1.7 | $ 2.2
Series B Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) |  | 555,555 |  |  |
Exercise price per share (in dollars per share) |  | $ 10.00 |  |  |
Private Placement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) |  |  | 1,111,111 |  |
Exercise price per share (in dollars per share) |  | $ 10.00 | $ 9.00 |  |
Minimum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  | $ 9.00 | $ 4.00
Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  | $ 11.00 | $ 11.00

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